The ability to directly observe the extreme conditions in the hearts of stars and planets is still a way off. Using high-powered lasers, physicists in Japan are doing the next best thing — for the ...

Lasers, LEDs and light sources are devices that create light. LEDs (light emitting diodes) convert an electrical current into light using spontaneous emission in optically active semiconductors.

Following laser surgery (photocoagulation) to repair a retinal tear, a person can typically expect a brief recovery period with minimal discomfort. Temporary symptoms may include mild irritation and ...